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How do I get variables from callback functions in MATLAB

2 次查看（过去 30 天）
noga cohen
noga cohen 2011-2-14
I programmed a pushbutton that I want to call to @GetValue function.
The GetValue function creates 2 variables (PupilColumn,BehavColumn). I don't know how to take these variables out from the @GetValue function in order to use them later. How should I program it correctly?
[PupilColumn,BehavColumn]=CreatePush(Figure_h,ColumnPupil_h,ColumnBehav_h)
function CreatePush(Figure_h,ColumnPupil_h,ColumnBehav_h)
PushButton_h = uicontrol(Figure_h, 'Style', 'push', 'String', 'Next', ...
'Position', [600 20 120 50], ...
'CallBack',{@GetValue,ColumnPupil_h,ColumnBehav_h}, ...
'UserData',0);
end
function [PupilColumn,BehavColumn] = GetValue(PushButton_h,ed,ColumnPupil_h,ColumnBehav_h)

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Walter Roberson
Walter Roberson 2011-2-14
Daniel is correct that callbacks cannot return anything. See the FAQ on this topic for various methods.

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Daniel Shub
Daniel Shub 2011-2-14
I do not think that callback functions can return anything. The variables PupilColumn and BehavColumn can be added to the application data (setappdata) of either PushButton_h or Figure_h.
setappdata(Figure_h, 'PupilColumn', PupilColumn);
Then when you want to use PupilColumn
PupilColumn = getappdata(Figure_h, 'PupilColumn');
This requires you to know Figure_h in order to get PupilColumn.

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